The height limitations of this chapter shall
not apply to:
A. Rooftop bulkheads, elevator penthouses, water towers,
fire towers, hose towers, cooling towers or air-conditioning or heating
equipment, provided that such features shall not occupy, in the aggregate,
more than 10% of the area of the roof of a building and are set back
from the edge of the roof at least one foot for each one foot by which
such features exceed the maximum height otherwise specified for the
district in which they are located. All such mechanical equipment
located on the tops of buildings shall be visually screened.
B. Parapet walls or cornices which do not exceed the
maximum height requirement for the district in which they are located
by more than four feet.